<template>
  <div class="puzzle" v-show="isVerificationShow">
    <div class="puzzle-container">
      <div class="puzzle-header">
        <span class="puzzle-header-left">请完成下列验证后继续</span>
        <div>
          <span class="re-btn iconfont icon-shuaxin" @click="refreshImg"></span>
          <span class="close-btn iconfont icon-guanbi" @click="closeVerificationBox"></span>
        </div>
      </div>
      <div :style="'position:relative;overflow:hidden;width:' + dataWidth + 'px;'">
        <div :style="'position:relative;width:' + dataWidth + 'px;height:' + dataHeight + 'px;'">
          <img
            id="scream"
            ref="scream"
            :src="imgRandom"
            :style="'width:' + dataWidth + 'px;height:' + dataHeight + 'px;'"
          />
          <canvas id="puzzle-box" ref="puzzleBox" :width="dataWidth" :height="dataHeight"></canvas>
        </div>
        <div
          class="puzzle-lost-box"
          :style="'left:' + left_Num + 'px;width:' + dataWidth + 'px;height:' + dataHeight + 'px;'"
        >
          <canvas id="puzzle-shadow" ref="puzzleShadow" :width="dataWidth" :height="dataHeight"></canvas>
          <canvas id="puzzle-lost" ref="puzzleLost" :width="dataWidth" :height="dataHeight"></canvas>
        </div>
        <p :class="'ver-tips' + (displayTips ? ' slider-tips' : '')" ref="verTips">
          <template v-if="verification">
            <i style="color: #52c41a" class="iconfont icon-tongguo"></i>
            <span style="color: #52c41a">验证通过</span>
          </template>
          <template v-if="!verification">
            <i style="color: #f5222d" class="iconfont icon-butongguo"></i>
            <span style="color: #f5222d">验证失败:</span>
            <span style="margin-left: 4px">拖动滑块将悬浮图像正确拼合</span>
          </template>
        </p>
      </div>

      <div class="slider-container" :style="'width:' + dataWidth + 'px;'">
        <div class="slider-bar"></div>
        <div
          class="slider-btn iconfont icon-youjiantou"
          ref="sliderBtn"
          @mousedown="startMove"
          @touchstart="startMove"
        ></div>
      </div>
    </div>
  </div>
</template>

<script>
/* eslint-disable */
export default {
  name: 'puzzleVerification',
  data() {
    return {
      isVerificationShow: false,
      moveStart: '',
      displayTips: false,
      verification: false,
      randomX: null,
      randomY: null,
      imgRandom: '',
      left_Num: 0,
      dataWidth: null,
      dataHeight: null,
      puzzleSize: null, // 滑块的大小
      deviationValue: null,
      radius: null,
      padding: null,
    }
  },
  model: {
    prop: 'verificationShow',
    event: 'setVisible',
  },
  watch: {
    isVerificationShow(val) {
      this.$emit('setVisible', val)
    },
    verificationShow(val) {
      this.isVerificationShow = val
    },
  },
  props: {
    // 画布图片的尺寸
    width: {
      type: [String, Number],
      default: 260,
    },
    height: {
      type: [String, Number],
      default: 120,
    },
    // 图集
    puzzleImgList: {
      type: Array,
      default: () => [
        'https://t7.baidu.com/it/u=2241078122,1942261122&fm=193&f=GIF',
        'https://t7.baidu.com/it/u=3848635474,1628226472&fm=193&f=GIF',
        'https://t7.baidu.com/it/u=2775453412,3865070165&fm=193&f=GIF',
      ],
    },
    // 滑块的大小
    blockSize: {
      type: [String, Number],
      default: 40,
    },
    // 误差
    deviation: {
      type: [String, Number],
      default: 4,
    },
    // 滑块的圆角大小
    blockRadius: {
      type: [String, Number],
      default: 4,
    },
    // 滑块随机出现的范围
    wraperPadding: {
      type: [String, Number],
      default: 20,
    },
    // 滑块形状 square  puzzle
    blockType: {
      type: String,
      default: 'square',
    },
    // 成功的回调
    onSuccess: {
      type: Function,
      default: () => {
        console.log('成功')
      },
    },
    // 失败的回调
    onError: {
      type: Function,
      default: () => {
        console.log('失败')
      },
    },
    verificationShow: {
      type: Boolean,
      default: false,
    },
  },
  mounted() {
    this.$nextTick(() => {
      this.initCanvas()
    })
  },
  created() {
    // 随机显示一张图片
    let imgRandomIndex = Math.round(Math.random() * (this.puzzleImgList.length - 1))
    this.imgRandom = this.puzzleImgList[imgRandomIndex]

    this.puzzleSize = Number(this.blockSize)
    this.deviationValue = Number(this.deviation)
    this.radius = Number(this.blockRadius)
    this.dataWidth = Number(this.width)
    this.dataHeight = Number(this.height)
    this.padding = Number(this.wraperPadding)
  },
  methods: {
    /* 关闭验证 */
    closeVerificationBox() {
      this.isVerificationShow = false
    },
    /* 刷新 */
    refreshImg() {
      let imgRandomIndex = Math.round(Math.random() * (this.puzzleImgList.length - 1))
      this.imgRandom = this.puzzleImgList[imgRandomIndex]
      this.initCanvas()
    },
    /* 画布初始化 */
    initCanvas() {
      this.clearCanvas()
      let w = this.dataWidth
      let h = this.dataHeight
      let PL_Size = this.puzzleSize
      let padding = this.padding
      let MinN_X = padding + PL_Size
      let MaxN_X = w - padding - PL_Size - PL_Size / 6
      let MaxN_Y = padding
      let MinN_Y = h - padding - PL_Size - PL_Size / 6
      this.randomX = Math.round(Math.random() * (MaxN_X - PL_Size) + MinN_X)
      this.randomY = Math.round(Math.random() * MaxN_Y + MinN_Y)
      let X = this.randomX
      let Y = this.randomY
      this.left_Num = -X + 4
      let d = PL_Size / 3
      let radius = Number(this.radius)

      let c = this.$refs.puzzleBox
      let c_l = this.$refs.puzzleLost
      let c_s = this.$refs.puzzleShadow
      let ctx = c.getContext('2d')
      let ctx_l = c_l.getContext('2d')
      let ctx_s = c_s.getContext('2d')
      ctx.globalCompositeOperation = 'xor'
      ctx.shadowBlur = 10
      ctx.shadowColor = '#fff'
      ctx.shadowOffsetX = 3
      ctx.shadowOffsetY = 3
      ctx.fillStyle = 'rgba(0,0,0,0.7)'
      ctx.beginPath()
      ctx.lineWidth = '1'
      ctx.strokeStyle = 'rgba(0,0,0,0)'
      if (this.blockType === 'square') {
        ctx.arc(X + radius, Y + radius, radius, Math.PI, (Math.PI * 3) / 2)
        ctx.lineTo(PL_Size - radius + X, Y)
        ctx.arc(PL_Size - radius + X, radius + Y, radius, (Math.PI * 3) / 2, Math.PI * 2)
        ctx.lineTo(PL_Size + X, PL_Size + Y - radius)
        ctx.arc(PL_Size - radius + X, PL_Size - radius + Y, radius, 0, (Math.PI * 1) / 2)
        ctx.lineTo(radius + X, PL_Size + Y)
        ctx.arc(radius + X, PL_Size - radius + Y, radius, (Math.PI * 1) / 2, Math.PI)
      } else {
        ctx.moveTo(X, Y)
        ctx.lineTo(X + d, Y)
        ctx.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y)
        ctx.lineTo(X + 3 * d, Y)
        ctx.lineTo(X + 3 * d, Y + d)
        ctx.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d)
        ctx.lineTo(X + 3 * d, Y + 3 * d)
        ctx.lineTo(X, Y + 3 * d)
      }
      ctx.closePath()
      ctx.stroke()
      ctx.fill()

      let img = new Image()
      img.src = this.imgRandom

      img.onload = function () {
        ctx_l.drawImage(img, 0, 0, w, h)
      }
      ctx_l.beginPath()
      ctx_l.strokeStyle = 'rgba(0,0,0,0)'
      if (this.blockType === 'square') {
        ctx_l.arc(X + radius, Y + radius, radius, Math.PI, (Math.PI * 3) / 2)
        ctx_l.lineTo(PL_Size - radius + X, Y)
        ctx_l.arc(PL_Size - radius + X, radius + Y, radius, (Math.PI * 3) / 2, Math.PI * 2)
        ctx_l.lineTo(PL_Size + X, PL_Size + Y - radius)
        ctx_l.arc(PL_Size - radius + X, PL_Size - radius + Y, radius, 0, (Math.PI * 1) / 2)
        ctx_l.lineTo(radius + X, PL_Size + Y)
        ctx_l.arc(radius + X, PL_Size - radius + Y, radius, (Math.PI * 1) / 2, Math.PI)
      } else {
        ctx_l.moveTo(X, Y)
        ctx_l.lineTo(X + d, Y)
        ctx_l.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y)
        ctx_l.lineTo(X + 3 * d, Y)
        ctx_l.lineTo(X + 3 * d, Y + d)
        ctx_l.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d)
        ctx_l.lineTo(X + 3 * d, Y + 3 * d)
        ctx_l.lineTo(X, Y + 3 * d)
      }
      ctx_l.closePath()
      ctx_l.stroke()
      ctx_l.shadowBlur = 10
      ctx_l.shadowColor = 'black'
      ctx_l.clip()
      ctx_s.beginPath()
      ctx_s.lineWidth = '1'
      ctx_s.strokeStyle = 'rgba(0,0,0,0)'
      if (this.blockType === 'square') {
        ctx_s.arc(X + radius, Y + radius, radius, Math.PI, (Math.PI * 3) / 2)
        ctx_s.lineTo(PL_Size - radius + X, Y)
        ctx_s.arc(PL_Size - radius + X, radius + Y, radius, (Math.PI * 3) / 2, Math.PI * 2)
        ctx_s.lineTo(PL_Size + X, PL_Size + Y - radius)
        ctx_s.arc(PL_Size - radius + X, PL_Size - radius + Y, radius, 0, (Math.PI * 1) / 2)
        ctx_s.lineTo(radius + X, PL_Size + Y)
        ctx_s.arc(radius + X, PL_Size - radius + Y, radius, (Math.PI * 1) / 2, Math.PI)
      } else {
        ctx_s.moveTo(X, Y)
        ctx_s.lineTo(X + d, Y)
        ctx_s.bezierCurveTo(X + d, Y - d, X + 2 * d, Y - d, X + 2 * d, Y)
        ctx_s.lineTo(X + 3 * d, Y)
        ctx_s.lineTo(X + 3 * d, Y + d)
        ctx_s.bezierCurveTo(X + 2 * d, Y + d, X + 2 * d, Y + 2 * d, X + 3 * d, Y + 2 * d)
        ctx_s.lineTo(X + 3 * d, Y + 3 * d)
        ctx_s.lineTo(X, Y + 3 * d)
      }
      ctx_s.closePath()
      ctx_s.stroke()
      ctx_s.shadowBlur = 20
      ctx_s.shadowColor = 'black'
      ctx_s.fill()
    },
    /* 通过重置画布尺寸清空画布，这种方式更彻底 */
    clearCanvas() {
      let c = this.$refs.puzzleBox
      let c_l = this.$refs.puzzleLost
      let c_s = this.$refs.puzzleShadow
      c.setAttribute('height', c.getAttribute('height'))
      c_l.setAttribute('height', c.getAttribute('height'))
      c_s.setAttribute('height', c.getAttribute('height'))
    },
    /* 按住滑块后初始化移动监听，记录初始位置 */
    startMove(e) {
      e = e || window.event
      this.moveStart = e.pageX || e.targetTouches[0].pageX
      this.addMouseMoveListener()
    },
    /* 滑块移动 */
    moving(e) {
      let self = this
      e = e || window.event
      let moveX = e.pageX || e.targetTouches[0].pageX
      let d = moveX - self.moveStart
      let w = self.dataWidth
      let PL_Size = this.puzzleSize
      let padding = this.padding
      if (self.moveStart === '') {
        return ''
      }
      if (d < 0 || d > w - padding - PL_Size) {
        return ''
      }
      self.$refs.sliderBtn.style.left = d + 'px'
      self.$refs.sliderBtn.style.transition = 'inherit'
      self.$refs.puzzleLost.style.left = d + 'px'
      self.$refs.puzzleLost.style.transition = 'inherit'
      self.$refs.puzzleShadow.style.left = d + 'px'
      self.$refs.puzzleShadow.style.transition = 'inherit'
    },
    /* 移动结束，验证并回调 */
    moveEnd(e) {
      let self = this
      e = e || window.event
      let moveEnd_X = (e.pageX || e.changedTouches[0].pageX) - self.moveStart
      let ver_Num = self.randomX - 4
      let deviationValue = this.deviationValue
      let Min_left = ver_Num - deviationValue
      let Max_left = ver_Num + deviationValue
      if (self.moveStart !== '') {
        if (Max_left > moveEnd_X && moveEnd_X > Min_left) {
          self.displayTips = true
          self.verification = true
          setTimeout(function () {
            self.displayTips = false
            self.initCanvas()
            /* 成功的回调函数 */
            self.onSuccess()
          }, 500)
        } else {
          self.displayTips = true
          self.verification = false
          setTimeout(function () {
            self.displayTips = false
            self.refreshImg()
            /* 失败的回调函数 */
            self.onError()
          }, 800)
        }
      }
      if (
        typeof self.$refs.sliderBtn !== 'undefined' &&
        typeof self.$refs.puzzleLost !== 'undefined' &&
        typeof self.$refs.puzzleShadow !== 'undefined'
      ) {
        setTimeout(function () {
          self.$refs.sliderBtn.style.left = '4px'
          self.$refs.sliderBtn.style.transition = 'left 0.5s'
          self.$refs.puzzleLost.style.left = 0
          self.$refs.puzzleLost.style.transition = 'left 0.5s'
          self.$refs.puzzleShadow.style.left = 0
          self.$refs.puzzleShadow.style.transition = 'left 0.5s'
        }, 400)
      }
      self.moveStart = ''
    },
    /* 全局绑定滑块移动与滑动结束，移动过程中鼠标可在页面任何位置 */
    addMouseMoveListener() {
      let self = this
      document.addEventListener('mousemove', self.moving)
      document.addEventListener('touchmove', self.moving)
      document.addEventListener('mouseup', self.moveEnd)
      document.addEventListener('touchend', self.moveEnd)
    },
  },
}
</script>

<style scoped>
@import url('./icon-font/iconfont.css');
.puzzle {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 1000;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.45);
}
.slider-btn {
  position: absolute;
  width: 64px;
  height: 38px;
  left: 4px;
  top: 3px;
  z-index: 12;
  cursor: pointer;
  background-color: #fff;
  border-radius: 5px;
  /* background-image: url(./sprite.3.2.0.png);
	background-position: 0 -84px; */
  transition: inherit;
  text-align: center;
  line-height: 38px;
}

.icon-youjiantou {
  color: rgb(179, 181, 183);
}
.ver-tips {
  position: absolute;
  left: 0;
  bottom: -22px;
  background: rgba(255, 255, 255, 0.9);
  height: 22px;
  line-height: 22px;
  font-size: 12px;
  width: 100%;
  margin: 0;
  text-align: left;
  padding: 0 8px;
  transition: all 0.4s;
  z-index: 99;
}

.slider-tips {
  bottom: 0;
}

.ver-tips i {
  display: inline-block;
  width: 22px;
  height: 22px;
  vertical-align: top;
  /* background-image: url(./sprite.3.2.0.png); */
  /* background-position: -4px -1229px; */
}

.ver-tips span {
  display: inline-block;
  vertical-align: top;
  line-height: 22px;
  color: #455;
}

.active-tips {
  display: block;
}

.hidden {
  display: none;
}

.puzzle-container {
  display: inline-block;
  position: relative;
  padding: 15px 15px 38px;
  border: 1px solid #ddd;
  background: #ffffff;
  border-radius: 16px;
  z-index: 2000;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.puzzle-header {
  display: flex;
  justify-content: space-between;
  margin: 5px 0;
}

.puzzle-header-left {
  color: #333;
}

.re-btn,
.close-btn {
  font-size: 16px;
  cursor: pointer;
  color: #666;
}

/* .re-btn:hover {
	color: #67c23a;
}

.close-btn:hover {
	color: #f56c6c;
} */

.close-btn {
  margin-left: 5px;
}

.slider-container {
  position: relative;
  margin: 10px auto 0;
  min-height: 15px;
}

.slider-bar {
  height: 44px;
  /* border: 1px solid #c3c3c3; */
  /* border-radius: 5px; */
  background: #f4f5f5;
  /* box-shadow: 0 1px 1px rgba(12, 10, 10, 0.2) inset; */
  position: absolute;
  width: 100%;
  top: 0;
}

#puzzle-box {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 22;
}

#puzzle-shadow {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 22;
}

#puzzle-lost {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 33;
}

.puzzle-lost-box {
  position: absolute;
  width: 260px;
  height: 116px;
  left: 0;
  top: 0;
  z-index: 111;
}
</style>
